Glue applying device in gluing machines



May 16, 1944. G. MAuRl-:R

GLUE APPLYING DEVICE IN GLUING MACHINES Filed Dec. 15, 1940- 4 Sheets-Sheet: 1

May 16, 1944. G. MAURER GL UE APPLYING DEVICE IN GLUING MACHINES Filed Deo. 13,' 1940 4 Sheets-Sheet 2 IN'VENToR, 6. Maurer May 16, 1944. G. MAURER 2,348,991v

GLUE APPLYING DEVICE I N GLUING MACHINES Filed Deo. 15, 1940 4 sheets-sheet s 5y. 5.

May 16, 1944. G. MAURER GLUE APPLYING DEVICE IN GLUING MACHINES 4 Sheets-She-et 4 Filed Dec. 13, 1940 Fis.

Patented May 16, 1944 y GLUE APPLYING DEVICE IN GLUING MACHINES Gottfried Maurer, Zurich, Switzerland, assigner to A. Mller & Cie, Maschinenfabrik und Eisengiesserei, Aktiengesellschaft, Brugg, Switzerland, a joint-stock company of Switzerland Application December 13, 1940, SeriallNo. 370,058 In Switzerland April 18, 1940 (Cl. S31-47) 6 Claims.

The present invention relates to a glue applying device in gluing machines, specially but not exclusively in conveying gluing machines.

In the gluing machines known up to date, e. g., in the joint gluers, the strip, e. g. the veneer strip to be glued has previously to be placed into an upright position in order that the edge to be glued may be carefully brought into contact with the glue. After this the strip has to be withdrawn from the glue and to be brought into a horizontal position, upon this acti-on only can it be forwarded into the conveying device to be glued together with other strips. The change of position of the strips and the great care necessary for bringing the strip edge into contact with the glue causes a great loss of time.

The glue applying device according to the invention remedies these inconveniences. It has a movable glue carrier. Owing to this feature, turning the strips from their horizontal into their vertical direction and vice versa is avoided. No special care need be taken, in that the strip edges have merely to be struck against the glue carrier. The device according to the invention is not only advantageously used in conveying gluing machines, but in all cases where glue must be applied in series to work pieces. The goods to be glued may even be made of other material than wood.

Another object is that the glue carrier or glue applying member moves above and below the conveying plane of the gluing machine.

A further object is that the glue carrier moves into and out of a glue tank.

Still other objects are to provide suitable means for driving said glue carrier, as well as suitable control mechanisms for putting said driving means into and out of operation.

The accompanying drawings illustrate one embodiment of the invention, mounted on a conveying device formed as a joint gluer for wood foils or wood boards. It is to be understood that the present disclosure is by way of illustration only and it is not to be looked upon as restrictive.

Fig. 1 is a longitudinal section of a part of the conveying device, showing the glue applying device from one side,

Fig. 2 is a section taken on line II-II of Fig. 1,

Fig. 3 is a section taken on line III- III of Fig. 1,

Fig. 4 is a section taken on line IV-IV of Fig. 5 is a section taken on line V-V of Fig. 1.

Figs. 6a and 6b are a top view of a part of the conveying device, showing the arrangement of the glue applying device from above.

The movable glue carrier 2 formed as a plate is disposed across the conveying direction indicated by the arrow I. In Figs. 1 and 2 this glue carrier 2 is illustrated, as entering a glue tank 3. By preference the glue carrier is roughened, e. g. fluted. The degree of roughness depends on the quantity of glue to be applied. The glue carrier has two arms 4 laterally bent (Fig. 2) and iixed to the bars 6 by means of the winged nuts 5. These bars 6 are pivotally mounted on rocking levers 1, 8 which are attached to the shafts 9 and I0. Further, a lever II is fixed to the shaft 9 and is, by means of a rod I2, connected with a rocking lever I4 mounted on the pivot I3. Lever I4 carries a roller I5 engaging a cam disc Il' loosely arranged on the shaft I6. A spring I3 connecting the rod I2 with a stationary point of the machine ensures a continuous contact making of the roller I5 with the cam disc Il. The ratchet wheel I9 is rigidly secured to the shaft I6 and is adapted to cooperate with the pawl 20 pivotally mounted on the loose cam disc II. Ratchet wheel I9 is driven, with the help of the worm gear 34, by a motor 35. The spring 2I xed to the pawl and the cam disc has the tendency to bring the pawl and the ratchet wheel into gear with each other. This engaging is either prevented or a1- lowed by a bent lever 23 pivotally xed at 22 (Fig. 5), whose one leg 24, forming a locking member, is intended to cooperate with the pawl 20 and whose other leg 25 is, by means of a pivotally attached rod 26, connected with the armature 2'I of a magnet 28 of a known structure. Into the electric circuit 29 of this magnet a mercury switch 30 (Figs. 3 and 4) is inserted, which is attached to a carrier 33 pivotally mounted on the case 32. This carrier, on the one side, is under the influence of the spring 36 xed to the case 32 and, on the other side, is pivotally connected with the bent lever 3l, in that a bolt 3B of the one leg of this bent lever enters a slot 39 of the carrier 33. The other leg of this bent lever, passing through an aperture 40 of the service table 4I of the conveying device, carries a striking plate 42 which, normally and under the effect of the spring 36, is pressed towards that wall 43 of the aperture 40 which lies near to the center of the service table 4I. The

terminals 44 serve the purpose of connecting the line parts of the electric circuit outside the case 32 to the line parts 29 lying inside.

The manner of action of the glue applying device described is as follows:

Be it supposed that the conveying gluer on which the illustrated gluing device is mounted is used as a joint gluer, e. g. for veneers. The device is, at rst, in the position shown in Fig. l. The worker then takes one of the veneer strips lying in stock and places it horizontally on the service table 4| and pushes it laterally and gently towards the striking plate 42. This latter thereby moves, seen in Fig. 3, to the right. Carrier 3.3 and with it the switch 3i) are, as seen in Fig. 3, turned in an anti-clockwise direction. The electric circuit 29 is thereby closed. The armature 21 held in its outermost position by a spring not shown, is attracted by the magnet 28 against the effect of said spring. Bent lever 23 is swung in a clockwise direction (Fig. and releases pawl 2S. This, under the influence of spring 2l, engages the continuously rotating ratchet wheel i9. Cam disc Il is thereby carried along in a clockwise direction (Fig. 1) and swings lever lll in an anti-clockwise direction. The glue carrier moves upwardly, rotating the protecting cover G5 around its hinges t6. So long as the part a-b-c of the cam disc il cooperates with the roller i5 the glue applying plate remains at the top and extends beyond the surface on which the goods to be glued are moved. During this period the worker may bring the edge of the veneer strip into contact with the glue applying plate. After the point c it recedes below the plane of the table 4l into the glue tank 3. The worker may forward the veneer strip treated to the conveying device in the same horizontal position in which he removed it from the service table and guided it to the glue applying plate. the veneer strip has been put out of contact with the striking plate 42, this and with it the switch 3i?, under the effect of the spring Sli, have returned into the rest position shown in Fig. 3. The electric circuit has thus been interrupted and the bent lever 23 returned into the position shown in Figs. l and 5. The pawl 2l] will` therefore, strike against the leg 24 of the lever 23 and thus disengage the ratchet wheel i8 and strike against the stop d1. The cam disc Il thus, in the position illustrated in Fig. l, automatically comes to rest and the glue carrier E remains below until the worker pushes a new veneer strip towards the striking plate i?, whereupon the cycle described begins anew.

It is understood that neither the constructive shape nor the field of employment of the gluing device is restricted to the embodiment shown. The structural details and arrangements may not only vary within the example shown, but they may also undergo suitable adaptation to the use in other gluers.

What I claim is:

1. In a gluing machine, a service table, a glue applying device comprising a glue applying member mounted to reciprocate above and below said service table, an interruptedly driven means in connection with said glue applying member' to drive the latter, a control means alternately to release and to stop said interruptedly driven means, a movable, striking member projecting above said service table, said glue applying member and said striking member being relatively arranged whereby the striking member is oper- At the moment when ated by movement ofthe workpiece in one d-irec- '1:5

tion and glue is applied to the workpiece by movement against the glue applying member in another direction, and a controller system in relation with said control means and said movable striking member, to be controlled by said movable striking member to operate said control means.

2. In a gluing machine, a service table, a glue applying device comprising a glue applying member mounted to reciprocate above and below said service table, an interruptedly driven means in connection with said glue applying member t0 drive the latter, an electro-magnetic means alternately to release and to stop said interruptedly driven means, a movable striking member projecting above said service table, an electric circuit including said electro-magnetic means, and a switch in said electric circuit, operable by said movable striking member to control said electromagnetic means.

3. In a gluing machine, a service table, a glue applying device comprising a glue applying member mounted to reciprocate above and below said service table, an interruptedly driven means in connection with said glue applying member to drive the latter, an electro-magnetic means alternately to release and to stop said interruptedly driven means, a movable striking member projecting above said service table, an electric circuit including said electro-magnetic means, and a pivotally mounted mercury switch in said electric circuit, operable by said movable striking member to contro-l said electro-magnetic means.

4. In a gluing machine, a service table, a glue applying device comprising a glue applying member mounted to reciprocate above and below said service table, a driving shaft, a cam disc loosely mounted on said driving shaft, motion-transmitting means connecting said cam disc with said glue applying member, a ratchet wheel fastened to said driving shaft, a spring-loaded pawl pivoted to said cam disc alternately to engage and disengage said ratchet wheel, an electro-magnetic means to control the engaging and disengaging of said pawl with said ratchet wheel, a movable striking member projecting abovek said service table, an electric circuit including said electro-magnetic means and a switch in said electric circuit, operable by said movable striking member to control said electro-magnetic means.

5. In a gluing machine, a service table, a glue applying device comprising a glue applying member mounted to reciprocate above and below said service table, a driving shaft, a cam disc loosely mounted on said driving shaft, motion-transmitting means connecting said cam disc with said glue applyincr member, a ratchet Wheel fastened to said driving shaft, a spring-loaded pawl pivoted to said cam dise alternately to engage and disengage said ratchet wheel, an electro-magnetic means to control the engaging and disengaging of said pawl with said ratchet wheel', a movable striking member projecting above said service table, an electric circuit including said electromagnetic means, a pivotally mounted spring'- loaded carrier in operative connection with said movable striking member, and a mercury switch in said eiectric circuit Xed to said carrier to control said electro-magnetic means..

6. In a gluing machine, a service table, a glue applying device comprising a glue applying member mounted to reciprocate above and below said service table, a driving shaft, a cam disc loosely mounted on said driving shaft, motion-transmitting means connecting said cam disc with said glue applying member, a ratchet Wheel fastened to said driving shaft, a spring-loaded pawl pivoted to said cam disc alternately to engage and disengage said ratchet Wheel, a lever to control the engaging and disengaging of said pawl with 5 said ratchet Wheel, an electro-magnetic means in driving connection with said lever, a movable striking Amember projecting above said service table, an electric circuit including said electromagnetic means, a pivotally mounted springloaded carrier in operative connection with said movable striking member, and a mercury switch in said electric circuit fixed to said carrier to control said electro-magnetic means.

GOTTFRIED MAURER. 

